Stable operation control system of atmospheric and vacuum distillation unit

Abstract

The utility model discloses a stable operation control system of an atmospheric and vacuum distillation unit, and relates to the field of normal production automatic control of atmospheric and vacuum distillation units. The device comprises a crude oil tank, a primary tower and an atmospheric tower, a crude oil feeding control application is arranged at the output end of the crude oil tank, a primary tower crude oil control is arranged at the outlet end of the primary tower, an atmospheric tower crude oil control is arranged at the output end of the atmospheric tower, and the crude oil feeding control application is used for controlling the liquid level of the crude oil tank entering the primary tower. The primary tower crude oil control is used for controlling the flow of the primary tower entering the atmospheric tower, and the atmospheric tower crude oil control is used for controlling the liquid level of the atmospheric tower. According to the device, the operation of taking the primary tower as the center is changed into the operation of taking the middle atmospheric tower as the center, so that the whip effect in the operation is avoided; operation is simple and convenient, and production safety is improved; if a variable frequency pump is used, the power consumption of an atmospheric and vacuum pump can be greatly reduced, and the processing cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of normal production automatic control of atmospheric and vacuum distillation unit, in particular to a stable operation control system of atmospheric and vacuum distillation unit. BACKGROUND

[0002] Crude oil feeding control of atmospheric and vacuum distillation unit is an important link in the refining process, which mainly refers to accurately controlling and adjusting the parameters such as the flow, pressure and temperature of the crude oil entering the atmospheric and vacuum distillation unit, so as to ensure that the crude oil can enter the unit for fractionation treatment stably and efficiently. This link is of great significance to improving product quality, reducing energy consumption and ensuring safe and stable operation of the unit.

[0003] The characteristics of the existing crude oil feeding control of atmospheric and vacuum distillation unit are as follows: in the normal production control of atmospheric and vacuum distillation unit, the pressure of the electric desalting tank is controlled by a pressure control valve before the tank, and a key flow control valve is set on the pipeline leading to the primary fractionating tower to control the flow entering the unit. A liquid control valve is used to control the liquid level at the bottom of the primary fractionating tower. This automatic control causes fluctuations in the amount of feed entering the atmospheric tower, which affects the operation of the atmospheric furnace, causes fluctuations in the operation of the atmospheric tower, further affects the operation of the vacuum furnace and vacuum tower, forms a whipping effect, and affects the smooth production of the atmospheric and vacuum distillation unit. In view of the above situation, the utility model provides a stable operation control system of atmospheric and vacuum distillation unit to solve the above problems. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides a stable operation control system of atmospheric and vacuum distillation unit, which solves the problem that automatic control causes fluctuations in the amount of feed entering the atmospheric tower, affects the operation of the atmospheric furnace, causes fluctuations in the operation of the atmospheric tower, further affects the operation of the vacuum furnace and vacuum tower, forms a whipping effect, and affects the smooth production of the atmospheric and vacuum distillation unit.

[0005] To achieve the above purpose, the utility model is implemented by the following technical scheme: including a crude oil tank, a primary fractionating tower and an atmospheric tower, a crude oil feeding control application is arranged at the output end of the crude oil tank, a primary fractionating tower crude oil control is arranged at the outlet end of the primary fractionating tower, and an atmospheric tower crude oil control is arranged at the output end of the atmospheric tower; the crude oil feeding control application is used to control the flow of the crude oil tank entering the primary fractionating tower; the primary fractionating tower crude oil control is used to control the flow of the primary fractionating tower entering the atmospheric tower; and the atmospheric tower crude oil control is used to control the liquid level of the atmospheric tower.

[0006] Preferably, the crude oil feed control application comprises a crude oil feed pump and a total flow control valve, the primary tower crude oil control comprises a primary tower bottom pump and a primary tower bottom flow control valve, the atmospheric tower crude oil control comprises an atmospheric tower bottom pump and an atmospheric tower bottom flow control valve, the atmospheric tower bottom flow control valve is arranged at the output end of the atmospheric tower bottom pump, the input end of the atmospheric tower is provided with an atmospheric furnace, and the output end of the atmospheric tower crude oil control is provided with a vacuum tower.

[0007] Preferably, the crude oil feed control application, the primary tower crude oil control and the atmospheric tower crude oil control are all variable frequency pumps.

[0008] Preferably, the primary heat exchange multi-path heat exchanger is arranged after the crude oil feed control application, and the input end of the primary heat exchange multi-path heat exchanger is provided with a primary flow control valve.

[0009] Preferably, the electric desalting tank is arranged after the primary heat exchange multi-path heat exchanger, and the inlet end of the electric desalting tank is provided with an electric desalting tank pressure control valve.

[0010] Preferably, the total flow control valve of the crude oil feed control controls the liquid level of the primary tower.

[0011] Preferably, the secondary heat exchange multi-path heat exchanger is arranged at the front end of the primary tower, and the input end of the secondary heat exchange multi-path heat exchanger is provided with a secondary flow control valve.

[0012] Preferably, the primary tower bottom pump is controlled by frequency conversion to control the flow into the atmospheric tower, and the stability of the feed amount is maintained.

[0013] The utility model discloses a kind of atmospheric and vacuum unit stable operation control system, it has the beneficial effects as follows: this kind of atmospheric and vacuum unit stable operation control system changes the operation with the center of primary tower to the operation with the center of intermediate atmospheric tower, avoid the emergence of whip effect in operation;It is simple and convenient to operate, improves production safety;Use variable frequency pump, guarantee the stability of operation, can greatly reduce the outlet pressure of atmospheric and vacuum pump, improve the safety of device operation, while greatly reducing device power consumption, save processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0015] Fig. 1 It is a whole process schematic diagram of the utility model scheme;

[0016] Fig. 2The second embodiment of the present application is a whole process schematic diagram.

[0017] In the figure: 1, crude oil tank; 11, crude oil feed control application; 111, crude oil feed pump; 112, total flow control valve; 2, primary heat exchange multi-way heat exchanger; 21, primary flow control valve; 3, electric desalting tank main body; 31, electric desalting tank pressure control valve; 4, secondary heat exchange multi-way heat exchanger; 41, secondary flow control valve; 5, primary distillation tower main body; 51, primary distillation tower crude oil control; 511, primary distillation tower bottom pump; 512, primary distillation tower bottom flow control valve; 6, atmospheric tower main body; 61, atmospheric furnace; 62, atmospheric tower crude oil control; 621, atmospheric tower bottom pump; 622, atmospheric tower bottom flow control valve; 7, vacuum tower; 8, variable frequency pump. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0019] The embodiment of the present application provides a crude oil unit stable operation control system, solves the problem that automatic control causes fluctuation of feed into an atmospheric tower, affects operation fluctuation of an atmospheric furnace, causes operation fluctuation of the atmospheric tower, further affects operation of a vacuum furnace and a vacuum tower, forms a whipping effect, and affects smooth production of the crude oil unit.

[0020] In order to better understand the above technical scheme, the above technical scheme will be described in detail in combination with the drawings of the specification and specific embodiments.

[0021] The embodiment of the present application discloses a crude oil unit stable operation control system.

[0022] According to the drawings Figs. 1-2 ,

[0023] The crude oil tank 1 is provided with a crude oil feeding control application 11 at the output end, and the primary distillation tower body 5 is provided with a primary distillation tower crude oil control 51 at the outlet end, the crude oil feeding control application 11 comprises a crude oil feeding pump 111 and a total flow control valve 112, the primary distillation tower crude oil control 51 comprises a primary distillation tower bottom pump 511 and a primary distillation tower bottom flow control valve 512, the total flow control valve 112 is arranged at the discharge end of the crude oil feeding pump 111, the primary distillation tower bottom flow control valve 512 is arranged at the discharge end of the primary distillation tower bottom pump 511, the crude oil feeding control application 11 and the primary distillation tower crude oil control 51 can be replaced by a variable frequency pump 8, the total flow control valve 112 is arranged on the pipeline to directly control the liquid level of the primary distillation tower body 5, the primary distillation tower bottom flow control valve 512 is arranged on the outlet pipeline of the primary distillation tower bottom pump 511 to control the flow of the crude oil into the primary distillation tower body 6, and the stable feeding of the intermediate primary distillation tower body 6 makes the primary distillation tower body 5 and the vacuum tower 7 have small fluctuations, thereby avoiding the whipping effect caused by the operation fluctuation of the primary distillation tower body 5 and stabilizing the safe production of the atmospheric-vacuum distillation unit. The stable source control is changed into the stable intermediate control, so that the purpose of stable production of the whole unit is achieved, the primary distillation tower crude oil control 51 is changed into the variable frequency pump control of the feeding amount of the primary distillation tower body 6, so that the crude oil feeding amount of the whole atmospheric-vacuum distillation unit can be controlled, and the total flow control valve 112 can be arranged at other positions on the pipeline system.

[0024] The primary heat exchange multi-way heat exchanger 2 is arranged behind the crude oil feeding control application 11, the input port of the primary heat exchange multi-way heat exchanger 2 is provided with a primary flow control valve 21 at the front end, the electric desalting tank body 3 is arranged behind the primary heat exchange multi-way heat exchanger 2, the inlet of the electric desalting tank body 3 is provided with an electric desalting tank pressure control valve 31 at the front end, the secondary heat exchange multi-way heat exchanger 4 is arranged at the front end of the primary distillation tower body 5, the input end of the secondary heat exchange multi-way heat exchanger 4 is provided with a secondary flow control valve 41 at the front end, and the pressure of the electric desalting tank body 3 is controlled to be 0.2 MPa higher than the saturated steam pressure of water corresponding to the operating temperature of the electric desalting tank body 3, that is, about 0.5-0.8 MPa.

[0025] The primary distillation tower body 5 is provided with the primary distillation tower body 6 at the output end, the primary distillation tower body 6 is provided with a primary distillation tower furnace 61 at the input end, the primary distillation tower body 6 is provided with a primary distillation tower crude oil control 62 at the output end, the primary distillation tower crude oil control 62 comprises a primary distillation tower bottom pump 621 and a primary distillation tower bottom flow control valve 622, the primary distillation tower bottom flow control valve 622 is arranged at the output end of the primary distillation tower bottom pump 621, the primary distillation tower crude oil control 62 can be replaced by a variable frequency pump 8, and the primary distillation tower crude oil control 62 is provided with the vacuum tower 7 at the output end, the feeding amount of the vacuum tower 7 is controlled by the variable frequency pump 8, or the liquid level of the primary distillation tower body 6 is controlled, and the two controls can only be selected.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] The stable operation control system of the atmospheric-vacuum distillation unit changes the operation centering on the main body 5 of the primary distillation tower to the operation centering on the intermediate atmospheric tower main body 6, avoids the whip effect in the operation, is simple and convenient in operation, improves the production safety, uses the variable frequency pump 8 to ensure the stable operation, can greatly reduce the outlet pressure of the atmospheric-vacuum pump, improves the safety of the device operation, simultaneously greatly reduces the power consumption of the device, and saves the processing cost.

[0028] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A stable operation control system for a crude oil distillation unit, comprising a crude oil tank (1), a primary distillation column main body (5), and an atmospheric column main body (6), characterized by, The output end of the crude oil tank (1) is provided with a crude oil feed control application (11), the outlet end of the primary distillation tower body (5) is provided with a primary distillation tower crude oil control (51), and the output end of the atmospheric tower body (6) is provided with an atmospheric tower crude oil control (62); The crude oil feed control application (11) is used to control the liquid level of the crude oil tank (1) into the primary distillation tower body (5), the primary distillation tower crude oil control (51) is used to control the flow of the primary distillation tower body (5) into the atmospheric tower body (6), and the atmospheric tower crude oil control (62) is used to control the liquid level of the atmospheric tower body (6).

2. The steady operation control system of a crude oil unit as claimed in claim 1, wherein: The crude oil feed control application (11) includes a crude oil feed pump (111) and a total flow control valve (112), and the primary distillation tower crude oil control (51) includes a primary distillation tower bottom flow control valve (512) and a primary distillation tower bottom pump (511). The total flow control valve (112) is arranged at the discharge end of the crude oil feed pump (111), and the primary distillation tower bottom flow control valve (512) is arranged at the discharge end of the primary distillation tower bottom pump (511).

3. The steady operation control system of a crude oil unit as claimed in claim 1, wherein: The atmospheric tower crude oil control (62) includes an atmospheric tower bottom pump (621) and an atmospheric tower bottom flow control valve (622), the atmospheric tower bottom flow control valve (622) is arranged at the output end of the atmospheric tower bottom pump (621), the input end of the atmospheric tower body (6) is provided with an atmospheric furnace (61), and the output end of the atmospheric tower crude oil control (62) is provided with a vacuum tower (7).

4. The steady operation control system of a crude oil unit as claimed in claim 1, wherein: The crude oil feed control application (11), the primary distillation tower crude oil control (51) and the atmospheric tower crude oil control (62) are all variable frequency pumps (8).

5. The steady operation control system of a crude oil unit as claimed in claim 1, wherein: The crude oil feed control application (11) is provided with a primary heat exchange multi-way heat exchanger (2) behind it, and the input port of the primary heat exchange multi-way heat exchanger (2) is provided with a primary flow control valve (21) in front of the input port.

6. The steady operation control system of a constant and reduced pressure device according to claim 5, characterized in that: The primary heat exchange multi-way heat exchanger (2) is provided with an electric desalting tank body (3) behind it, and the inlet of the electric desalting tank body (3) is provided with an electric desalting tank pressure control valve (31) in front of the inlet.

7. The steady operation control system of a crude oil unit as claimed in claim 4, wherein: The primary distillation tower body (5) is provided with a secondary heat exchange multi-way heat exchanger (4) in front of the primary distillation tower body (5), and the input end of the secondary heat exchange multi-way heat exchanger (4) is provided with a secondary flow control valve (41) in front of the input end.

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